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Towards “green” viscoelastically prestressed composites: Cellulose fibre reinforcement

Qin, Yang; Fancey, Kevin S.

Authors

Yang Qin

Abstract

With growing concerns over environmental issues, fibre reinforced composites based on renewable, biodegradable low-cost cellulosic/cellulose fibres increasingly attract interest. This paper reports on the first study to produce viscoelastically prestressed polymeric matrix composites (VPPMCs) using regenerated cellulose/viscose continuous fibres. The aim was to demonstrate that this prestressing technique could improve the mechanical properties of a cellulose fibre reinforced composite without the need to increase section mass or thickness. By investigating the viscoelastic properties of cellulose yarn, a suitable load was applied to subject the fibres to tensile creep. The load was then released and the loose yarns were moulded into a polyester resin matrix. Following matrix solidification, the viscoelastically recovering fibres imparted compressive stresses to the matrix. The mechanical properties of these cellulose fibre VPPMCs were investigated by tensile, three-point flexural and Charpy impact tests. Under the creep conditions investigated, the VPPMC samples demonstrated up to 20% increase in tensile strength and modulus and a comparable improvement in flexural properties, compared with control (unstressed) counterparts. Nevertheless, the prestress effect reduced impact toughness by ~30%, by impeding matrix crack formation and promoting fibre fracture. Based on findings from this paper, all-green VPPMCs may be achieved in the future by considering potentially suitable green resins.

Journal Article Type Article
Publication Date Dec 1, 2018
Journal Composites Part B: Engineering
Print ISSN 1359-8368
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 154
Pages 439-448
Institution Citation Qin, Y., & Fancey, K. S. (2018). Towards “green” viscoelastically prestressed composites: Cellulose fibre reinforcement. Composites. Part B, Engineering, 154, 439-448. doi:10.1016/j.compositesb.2018.08.096
DOI https://doi.org/10.1016/j.compositesb.2018.08.096
Keywords Polymer-matrix composites (PMCs); Residual/internal stress; Mechanical testing; Viscoelasticity
Publisher URL https://www.sciencedirect.com/science/article/pii/S1359836818309235?via%3Dihub
Additional Information This is the accepted manuscript of an article published in Composites part B: engineering, 2018. The version of record is available at the DOI link in this record.

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Copyright Statement
©2018, Elsevier. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/





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